Vat dye.



. chlorid.

anthraquinone are heated to boiling for about and 40 parts of benzoylchlorid. The new JOSEPH DEINET, OF ELBERFELD, GERMANY, ASS IGNOR TOFARBENFABRIKEN VORM.

ELBERFELD GE-RMANY, A CORPORATION OF GERMANY.

VAT DYE."

935,781, Specification of Letters Patent. No Drawing. Application filedMay 15, 1909.

Patented Oct. 5, 1909. Serial No. 496,112.

To all whom it may concern:

Be it known that I, JOSEPH DEINET, citil 'zen of the German Empire,residing at l Elberi'eld, Germany, have invented new and i usefulImprovements in Vat Dyestutl', of; which the following is aspecification. 5

My invention relates to the productionof a new anthracene derivative. Itis obtained 1 by converting the l.5-diamino-8-oXyanthral quinone intoits 'dibenzoylated derivative. The reaction is carried out by treating115- dia-mino 8 oxyanthraquinone with benzoyl Example: 10 parts ofl.5-diamino-8-oxyhalf an hour with 100 parts of nitrobenr ienecondensation product crystallizes fronrthe' cooling liquid in the shapeof red crystals which are filtered off and dried. It is solu ble inpyridin with a red color, in a small quantity of concentrated sulfuricacid with a bluish-gray color, while on addition of more acid thesolution appears redf By treatment NaOHa red .vat, is cotton, Wool orsilk dyestuif of i the anthracene series which is the1.5-dibenzoyldiaInino-8-oxyanthraquinone, which dyestuff is, afterbeing, dried and pulverized, a red powder which is soluble in pyridinwith a red color; solublein a small quantit of concentrated sulfu icacid with a bluishgray color, while on addition of more acid thesolution appears re giving a red vat with hydrosulfite and caustic sodasubstantially as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

[its] lye, Whichvat dyes the textile fiber bluish-red shades,

